March 6, 2008 - Beaverton, OR - Voxtel, Inc. plans to announce its entry into the business of manufacturing “green” semiconductor and metal-oxide nanocrystals for a wide variety customer applications, including: photovoltaic solar cells, electro-luminescent lighting, anti-counterfeiting taggants, and security inks. Voxtel’s focus is on the synthesis and scaling-to-manufacture of “green”, environmentally-friendly semiconductors and semiconductor core-shell nanocrystals.

George Williams, Voxtel’s CEO, states, “The benefits of Voxtel’s new business entry are significant.There has been tremendous research in the area of nanocrystal quantum dots, a majority of which hascontained toxic elements such as lead and cadmium.” Williams expressed interest in extending the benefit of the green technology on a global scale, stating, “One of our corporate goals is to allow economical development through efficient solar cell distribution to the billions of people living in the most remote regions of the world, who are off of the power grid, giving them the power necessary to thrive. Such a goal cannot be realized without the refinement of environmentally friendly materials.”

Voxtel currently offers approximately twenty nanoparticles of various sizes. Voxtel’s primary expertise lies not only in the ability to synthesize the nanoparticles themselves, but also, more importantly, to customize the nanoparticle by functionalizing the material through special polymeric coverings that allow them unique properties beyond those of the nanoparticles themselves.

ABOUT VOXTEL, INC.
Voxtel, Inc., of Beaverton, OR, is a provider of optoelectronic devices using novel semiconductor architectures and nanotechnology-engineered materials, and a leading developer of sophisticated detectors and electro-optical imaging systems for a wide range of government, industrial, and scientific markets. Their product technologies include near-infrared laser radar (LADAR) receivers, radiation hardened imagers for space applications, highly sensitive avalanche photodiodes for fiber and freespace telecommunications, and nanotechnology-engineered materials. For more information, visit Voxtel’s website at www.voxtel-inc.com.

CONTACT
Katie Omweg
Voxtel, Inc.
T. 971.223.5646 x 131
F. 971.327.7241
katieo@voxtel-inc.com
www.voxtel-inc.com

The performance of these VIC series SiPMs are superior to that of conventional photomultiplier tubes (PMTs), with the compactness and added benefits of semiconductor detectors, and high gain ~106 allowing the detection of single photons.

The VIC series SiPMs are optimal for a wide range of new applications from fluorescence-lifetime imaging to positron-emission tomography, nuclear medicine (medical imaging), high energy physics (calorimetry), radiation detection, laser range finding (lidar), particle sizing, and laser-induced fluorescence detection applications, including DNA-sequencing.

The SiPM operates by amplifying weak optical signals using multiple single-pixel photon-counting detectors, fabricated in an array, and with all of the outputs connected together to produce a large-area high-gain avalanche photodiode (APD) detector. Each pixel operates in Geiger mode with a gain of 106. In this parallel configuration, each pixel has an integrated quench resistor and behaves as a photon counting sensor, contributing a pulse of charge to the common output on detection of a photon. The device has an output proportional to the number of photons arriving at any particular time, in effect, as a high-gain linear photodiode. The VIC series SiPM devices can be tuned to detect photon fluxes ranging from single photons to millions of photons per second.

Voxtel has designed the SiPM for its series of photon counting, time of-flight (tof ), and DNA sequencing instruments.

ABOUT VOXTEL, INC.
Voxtel, Inc., of Beaverton, OR, is a provider of optoelectronic devices using novel semiconductor architectures and nanotechnology-engineered materials, and a leading developer of sophisticated detectors and electro-optical imaging systems for a wide range of government, industrial, and scientific markets. Their product technologies include near-infrared laser radar (LADAR) receivers, radiation hardened imagers for space applications, highly sensitive avalanche photodiodes for fiber and freespace telecommunications, and nanotechnology-engineered materials. For more information, visit Voxtel’s website at www.voxtel-inc.com.

CONTACT
Katie Omweg
Voxtel, Inc.
T. 971.223.5646 x 131
F. 971.327.7241
katieo@voxtel-inc.com
www.voxtel-inc.com

Andrew S. Huntington, Madison A. Compton and George M. Williams

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